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Other phosphine based amide dehydration reagents have been reported: (a) Sugimoto, O.; Mori, M.; Moriya, K.; Tanji, K.-i. Helv. Chim. Acta 2001, 84, 1112.
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Other phosphine based amide dehydration reagents have been reported: (a) Sugimoto, O.; Mori, M.; Moriya, K.; Tanji, K.-i. Helv. Chim. Acta 2001, 84, 1112.
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Similar conditions have been used for azidation of 1,2- and 1,3-diols. See: He, L.; Wanunu, M.; Byun, H.-S.; Bittman, R. J. Org. Chem. 1999, 64, 6049.
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Similar conditions have been used for azidation of 1,2- and 1,3-diols. See: He, L.; Wanunu, M.; Byun, H.-S.; Bittman, R. J. Org. Chem. 1999, 64, 6049.
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It has been proposed that when using HN3 in the Mitsunobu reaction, the azide may add to the phosphonium ylide intermediate and increase its reactivity. See: Afonso, C. M, Barros, M. T, Godinho, L. S, Maycock, C. D. Tetrahedron 1994, 50, 9671
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It has been proposed that when using HN3 in the Mitsunobu reaction, the azide may add to the phosphonium ylide intermediate and increase its reactivity. See: Afonso, C. M.; Barros, M. T.; Godinho, L. S.; Maycock, C. D. Tetrahedron 1994, 50, 9671.
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3P/DIAD has been used for azidation of alcohol see Viaud, M. C.; Rollin, P. Synthesis 1990, 130.
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3P/DIAD has been used for azidation of alcohol see Viaud, M. C.; Rollin, P. Synthesis 1990, 130.
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A referee pointed out the following reference: Volante, R. P. Tetrahedron Lett. 1981, 22, 3119 where the formation of a precipitate was observed within 30 min upon adding DIAD to Ph3P at a concentration of 0.4 M in THF at 0 °C. They reported that this precipitate was essential for the success of this reaction. In our case, we observed the formation of the precipitate only in the presence of TMS-N 3 at room temperature and a concentration of 0.1 M and as low as 0.05 M. When the substrate is present, the precipitate is often not observed or is seen only transiently. It is possible that we observed the formation of the same species as Volante and that the role of the TMS-N3 is to speed the formation of this intermediate but the fact that we do see an azide band in the IR of the solid suggest that we have a different species
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3 is to speed the formation of this intermediate but the fact that we do see an azide band in the IR of the solid suggest that we have a different species.
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2 or from hexanes to ethyl acetate).
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2 or from hexanes to ethyl acetate).
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2 (6 mL) and the white solid was filtered and dried under vacuum to give 317 mg of white solid (50% yield).
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2 (6 mL) and the white solid was filtered and dried under vacuum to give 317 mg of white solid (50% yield).
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McClure, K. F.; Abramov, Y. A.; Laird, E. R.; Barberia, J. T.; Cai, W.; Carty, T. J.; Cortina, S. R.; Danley, D. E.; Dipesa, A. J.; Donahue, K. M.; Dombroski, M. A.; Elliott, N. C.; Gabel, C. A.; Han, S.; Hynes, T. R.; LeMotte, P. K.; Mansour, M. N.; Marr, E. S.; Letavic, M. A.; Pandit, J.; Ripin, D. B.; Sweeney, F. J.; Tan, D.; Tao, Y., J. Med. Chem. 2005, 48, 5728.
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McClure, K.F.1
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Cortina, S.R.7
Danley, D.E.8
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Elliott, N.C.12
Gabel, C.A.13
Han, S.14
Hynes, T.R.15
LeMotte, P.K.16
Mansour, M.N.17
Marr, E.S.18
Letavic, M.A.19
Pandit, J.20
Ripin, D.B.21
Sweeney, F.J.22
Tan, D.23
Tao, Y.24
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